Blowpipe.



A. G. LE CHATELIER.

BLOWPIPB. APPLICATION FILED SEPT. l0, 1908.

Y JW fzfwzg@ Patented July 22, 1913.

ANDR GABRIEL LE CHATELIER, OF MARSEILLE, FRANCE.

BLOWPIPE.

Specification of Letters Patent.

Patented Jaiyee, isla,

Application led September 10, 1908. Serial No. 452,493.

To all whom may concern.'

Be it known that I, ANDR GABRIEL LE li-iii'rnriicn, a citizen of theFrench Republic, and resident of Marseille, France, have inventedcertain new and useful Improvements in Blowpipeae which the following isa specification.

-This invention has reference .to means for regulating the feed of gasesin blow-pipes.

It has been observed that in apparatus such as oxyhydric,ox'y-acetylenic or other blow-pipes in which one of the gases under alow pressure is drawn along by means of an injector or some mixingdevice, owing to the pressure under which the other gas is used, theflame originally regulated to suit the work to be done deterioratesgradually as the blow-pipe becomes heated. If for example anoxy-ace-tylenic blow-pipe be employed in which the acetylene produced bya generator is drawn along by a'current oi oxygen under pressure, itWill be noticed that the flame which was properly regulated to commencewith becomes gradually oxidizing. This might be very detrimental to thequalit-y of the Work to be done, particularly in the case of theautogenous soldering or iron and steel, the eect of the oxidizationbeing to increase considerably the resistance of the metal to thesoldering. The action .of this phenomenon may be readily observed byheating at one point a pipe in which a gaseous current circulates fedfrom a reservoir whence the as issues at a definite pressure; it Will efound that the volume or' gas discharged goes on diminishing as thecreased. It lis as if the heating produced a resistance to thecirculation of the gas, 'a resistance which may be compared to acounter-pressure which Would have the same retarding ei'i'ect upon theflowI of the gas. It follows that the heating or' the body of theblow-pipe Will have its greatest retarding effect on that gas which isadmitted to it under the lowermost pressure, and consequently therelative proportion of the second gas in the mixture will increase. Inthe case of the Oxy-acetylenic blow-pipe for example the proportion ofacetylene Will diminish more quickly than that of the oxygen and theflame Will become oxidizing, as already indicated above.

The object of the present invention is to remedy this defect, and thisis readily aclocal heating of the pipe is in f complished by utilizingthe phenomenon itself of the resistance produced by the heating or' thepassage in which the gas circulates. For this purpose all that isnecessary is to modify the course of the pipe which leads the highpressure gas to the mixing chaniber-the oxygen, in the case of theoxyacetylenic bloW-pipe-so that this pipe receives a supplementaryheating upon a certain portion of itslength, for example by causing itto make one or more turns around the head of the blowpipe in proximityto the Haine.

v In the accompanying drawing: the ligure shows this arrangement inelevation.

In the figure, l is the feed tube of the gas under low pressure(combustible gas) and 2 is the high pressure gas tube (for the oxygen)arranged as explained above.

The correctness of the views which have led up to this method isdemonstrated in another Way by the fact that if the length of pipesubmitted to the action of the flame be increased unduly, the object inview rs overstepped, causing a derangement the reverse of that which itis desired to obviate. By suitably regulating for each blow-pipe thearrangement of the tube with a View to the heating of the high pressuregas, there will be no deterioration of the iame during the progress ofthel Work, either in the one direction or in the other, a result Whichisso much the more important seeing that this deterioration, when it takesplace, rcornes about gradually and escapes for some time the attentionof the Workman. y

Having now fully described my' said invention,iWhat claim and desire tosecure by Letters Patient, is

'1. In a blorfv pipe, the combination of a nozzle with pipes conveyinggases of di'erent pressures into said nozzle, the pipe hav` ing the gasunder hio'her ressure embodying a portion extending ongitudinally of thenozzle and a portion coiled around said nozzle back of the dischargeport of said nozzle and a portion extending into the reai end of saidnozzle in alinement With said discharge port, whereby the gas passinfrthrough the coil is heated and expanded, su stantially as specified.

nozzle with pipes conveying gases under different pressure into saidnozzle,one of said pipes having a looped portion lying 2. In a blowpipe, the combination of a nozzle in the zone of the heat fom the amealong the sds and paralel to the length I In tesbmony whereofhavehereunto set of t e sald nozzle, the looped portlon of my hand mprese of awo Wltnesses.

sai eterminan ba 1 o the en oif'"he z v d p p L g f l mma?, @HMM EGMTELER.

of said nozzle whereby the gas in said Vtnssses:

loopedort-lon 1s heated and expanded, sub JEAN s,

stantla y as specled. Mmm@ Mommz

